Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

British Commonwealth - Pakistan - Bahawalpur

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Start price: $100

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1949, 75th Anniversary of the UPU, four imperforate trial color proofs in various color combinations, all are corner sheet margin examples, full OG, NH, VF, Est. $200-$250, Scott #26-29